Question

我希望动态添加复选框控件，在循环中生成的不同标签中使用不同的id

 <table border="1">
            <thead>

                <%string j = " Check"; %>
                <%for (int i = 0; i < 10;i++ )
                  {%>


                <th style="padding:2px; width:500px;">Table Head<br /><br />

                  <%
                      CheckBox chk = new CheckBox();
                      chk.ID = i + j;
                      chk.Text = "I am " + i + j; 
                       %> 
    //I want this checkbox to be added dynamically here with different id's in different th tags generating in a loop
               <asp:CheckBox runat="server"  ID="<%=i+j%>"/>


                </th>


                <%} %>

            </thead>
        </table>

Answer 1

执行此操作的方法是使用您需要的所有参数创建服务器控件，在 OnInit 中创建控件，并在< em> RenderControl ，并从公共道具访问控件，如下所示：

public class DynamicCbs : Control
{
  public int CtrlsCount { get; set; }
  public List<CheckBox> lstCheckBoxs;

  /// decleration of controls must be in the OnInit since the next stage of the page life cycle is to connect whatever came back from the client to the server
   protected override void OnInit(EventArgs e)
  {
       base.OnInit(e);
       lstCheckBoxs = new List<CheckBox>();
       for (int i = 0; i < CtrlsCount; i++) 
       {
          string id = "DynamicCbs" + i;
          CheckBox cbx = new CheckBox() 
          {
             ID = id,
             Text = "i am " + id 
          };
          lstCheckBoxs.Add(cbx);
          //add controls to control tree
           this.Controls.Add(cbx); 
       }
   }

   /// here you must build ur html
    public override void RenderControl(HtmlTextWriter writer) 
   {
       writer.RenderBeginTag(HtmlTextWriterTag.Table);
       writer.RenderBeginTag(HtmlTextWriterTag.Thead);
       foreach (var cbx in lstCheckBoxs)
       {
          writer.RenderBeginTag(HtmlTextWriterTag.Th); 
          cbx.RenderControl(writer);
          writer.RenderEndTag();
       }
       writer.RenderEndTag();//thead
        writer.RenderEndTag();//table
    }
}

full example

Answer 2

好的，我找到了解决方案。我用asp：Table控件来解决这个问题我的aspx页面代码是：

<asp:Table ID="ObjectwiseTable2" runat="server"
  CssClass="AccessTable" BorderColor="Black" width="100%">
 </asp:Table>

我在页面中添加内容和动态内容的.cs页面代码是：

       TableHeaderRow thead = new TableHeaderRow();
                    TableHeaderCell th = new TableHeaderCell();
                    th.Controls.Add(new LiteralControl("Object Wise Detail(s)"));
                    th.RowSpan = 2;
                    thead.Cells.Add(th);
                    int totalUsers = accesswiseDt.Rows.Count;

                    for (int User = 0; User < totalUsers; User++)
                    {
                        TableHeaderCell th2 = new TableHeaderCell();
                        th2.Controls.Add(new LiteralControl(accesswiseDt.Rows[User]["users"].ToString()));
                        IsReviewPending = view_access.IsWaitingForViewAccess(ApplicationTree.SelectedNode.Value, Session["empCode"].ToString(), accesswiseDt.Rows[User]["empcode"].ToString());
                        if (IsReviewPending)
                        {
                            th2.Controls.Add(new LiteralControl("<br />"));
                            CanReviewAccess = true;
//Code for Adding Dynamic control in specific cell of the table
                            CheckBox chk = new CheckBox();
                            chk.ID = ApplicationTree.SelectedNode.Value + "_" + accesswiseDt.Rows[User]["empcode"].ToString();
                            chk.Text = "Access Reviewed";
                            th2.Controls.Add(chk);

                        }

                        thead.Cells.Add(th2);
                    }

直接在aspx页面上添加动态控件，而不是从后端代码添加

2 个答案: